Current-collecting device



C. B. MILLS. CURRENT COLLECTING DEVICE. APPLICATION FILED NOV-26. 191B.

Patented Aug. 2 9,.1922.

INVENTOR C/Ms/erBM/As. BY

ATTORNEY UNITED STATES Persm OFFICE.

CHESTER B. MILLS, or EAST'MCKEESPORT, PENNSYLVANIA, assienon, TO WESTINGHOUSE ELECTRIC &

VANIA.

To all whom it may concern: i

, Be, it known that I, CHE'sTER B. MILLs, a citizen of the UnitedStates, anda resident of East McKeesport, in the county of Allegheny andState of Pennsylvania, havein vented a new and useful Improvement inCurrent-Collecting Devices, of which the following is a specification.

My invention relates to brush-supporting devices, being particularlyadapted for use with current-collecting rings, and it has for its objectto provide apparatus of the character designated that shall be simpleand in; expensive in construction and in which the brush-adjustmentshall be reduced to a minimum. In the accompanying drawings, Fig. 1 isan end-elevational view of a portion of a dynamo-electric machineprovided with ourcordancewith my invention; Fig.2 is a detail plan viewof an individual brush box showing the radial adjusting device alsoshown in Fig. 1, and Fig. 3 is a sectional View along the line III-IIIof Fig. 1 and showing the longitudinal adjusting device embodied in myinvention.

Heretofore, in assembling dynamo-electric machines, it has beennecessary to adjust the individual brushes with respectto the col lectorrings very carefully. By my inven tion, I reduce the amount of necessaryadjustment to a minimum and, at the same time, produce a device whereinthe brushes are both radially and longitudinally adjustable, and inwhich the parts are so designed as to be readily adapted for die castingand for ready assembly and easy inspection.

For a better understanding of my inven-. tion, reference may be had tothe accompanying drawings in which I show a portion of a dynamo-electricmachine 1 provided with an end bracket 2 having projecting arms 3 uponwhich a current-collectlng device i is mounted. The current-collectingdevice 4 coniprisesan arcuate brush carrier 5 supporting a plurality ofbrush boxes 6. Each oi the brush boxes 6 comprises a box structure 8having side lugs 9 whichare provided with slots 10 through which bolts11 extend to attach the brush box to the carrier 5. Radial adjustmentmay be efi'eeted, as the collector rings Wear down, by loosening thebolts 11, sliding the brush box toward the collector ring in a radialdirection,

' Specification'of Eetters Patent.

Application filediNovemb er 26, 1912.

l and again tightening the bolts.

. conducting material and MANUFACTUR NG COMPANY, A' CORPORATION OFrENNsYL CURRENT-COLLECTING :DEVICE- Patented Aug. 29, 1922'. SerialN0.,264,235. i X

7 brush12 the brush box 6 and is with a collector ring 7 is mountedwithin held in engagement by means of a mounted upon the brush carrier 5by means of a bolt 1.4. The inner end of the spring 1" is fastened to asleeve member 15 that surrounds the bolt 14; and is provided with aratchet wheel 16 which isheld in position by means of a pin or lug 17projecting from the brush carrier 5. In order to adjust the pressure ofthe spring upon the brush, the bolt 14 may be loosened sufliciently topermit the sleeve 15 to be moved outwardly thereon until the ratchetwheel clears the end of the pin 17 The ratchet wheel may then beturnedto effect the desired adjustment of spring pressure; after whichit may I be replaced, with one of its teeth in engagerent-collectlngdevices constructed in acment with the pin 17, position by the bolt14,-.

The brush carrier 5 is and be clamped in composed of good iselectrically connected to the brushes 12 by means of flexible shunts 18,as well as through the brush box 6, and is connected to an externalcircuit by means of terminals 19 welded upon the outer peripherythereof. The arms 3 of the end member 2 are provided with a plurality oflongitudinally-extending pins 20, only one of which is shown, whichsupport a plu rality of brush carriers 5, 21 and 22 and are separatedtherefrom by insulating sleeves 23 and from each other by shortinsulating sleeves 24. The brush carriersmay be longitudinally adjustedby means of a threaded nut 25 and a'coacting threaded sleeve 26 that ismounted. upon the pin 20 intermediate the sleeve 24L and the arm 3. Whenthe desired longitudinal adjustment has been made, the carriers may belocked in position by means of a threaded lock nut 27, also mounted uponthe sleeve 26, and a bolt. 28 having threaded engagement with the otherend of the pin 20.

It will be understood by those skilled in the art that, by my invention,I have produced a device which reduces the labor of adjusting thebrushes of collector rings to a minimumandwhich is composed of partsthat may be inexpensively constructed and are strong and durable. v

While I have shown. but one form of my invention, and described, indetail, but one application of the same, it Will be obvious spring 13that is separately to those skilled in the art that it is not so limitedbut is susceptible of various minor changes and modifications \VlLhOlli)depaiting from the spirit thereof, and I desire, therefore, that onlysuch limitations shall be placed thereupon as are imposed by the priorart or are specifically set forth in the appended claims.

I claim as my invention:

1. In a current-collecting device, a collector ring, a brush carrieradapted to hold a plurality of brushes in engagement With said ring, andmeans for longitudinally adjusting said carrier and said brushes a unit,and means for radially adj usting said individual brushes.

2. In a current-collecting device, a plurality of collector rings, aplurality of arcuate-shaped brush carriers of conducting of brushes inengagement with one of said rings, a plurality of members adapted tosupport said brush (if-llllOI'S, and threaded means disposed thereon tolongitudinally adjust said carriers and said brushes as a unit.

In testimony ivl'iereot', I have hereunto subscribed my name this 30thday of Oct,

CHESTER B, MILLS.

